透明聚丙烯的研制

通过添加成核剂，不但可以明显地改善均聚聚丙烯（PP）的光学性能，使PP的雾度下降50％－60％，而且可以提高增透PP的力学性能，并在某种程度上改善其加工性能。为进一步降低成本，提高增透PP性能，研制了成核剂的复配体系。此复配体系性能优于进口产品。同时，讨论了加工温度和基础树脂对透明PP光学性能的影响。     

注塑级透明聚丙烯专用料的研制与生产

通过添加成核剂,不但明显改善均聚聚丙烯的光学性能,使聚丙烯的雾度下降80%,而且提高了增透PP的力学性能,并在某种程度上改善了其加工性能。为降低生产成本并进一步提高增透PP性能,研制了成核剂的复配体系。此成核剂的复配体系性能优于美国MILLAD3988。用其生产的透明聚丙烯TX30G的各项性能均达到合同指标。同时讨论了加工温度和基础树脂对透明聚丙烯光学性能的影响。     

BOPP香烟包装热收缩膜增刚母料的开发

在双向拉伸聚丙烯(BOPP)香烟包装热收缩膜增刚母料中加入10%～30%的氢化石油树脂,能明显改变聚丙烯(PP)高分子链的聚集态结构,改善PP的加工性能和光学性能,增加高分子链拉伸取向的能力,提高PP的弹性模量和包装的挺括度。通过氢化石油树脂的选择、相容改性剂的选择和生产工艺的确定研究了BOPP香烟包装热收缩膜增刚母料的开发,研究表明:所开发的增刚母料的各项使用性能指标均相当或好于进口增刚母料。     

增刚母料在BOPP烟包装膜中的应用

通过在聚丙烯(PP)中添加自主研发的增刚母料,研究增刚母料对PP熔融与结晶性能的影响,以及增刚母料添加量对双向拉伸PP(BOPP)烟包装膜性能的影响.研究表明:当增刚母料质量分数为20％时,改性PP的熔体流动速率从PP的3.2 g/10 min提高到21.5 g/10 min,熔点降低10.2℃,结晶温度降低16.9℃...     

注塑级透明聚丙烯专用料的研制与生产

以均聚聚丙烯(PP)为基体树脂,通过添加成核剂制备了注塑级透明PP专用料。成核剂的加入．不但改善了PP的光学性能,而且提高了PP的刚性,在某种程度上改善了其加工性能。为降低生产成本和提高透明PP的性能,研制了复配成核剂体系,添加该成核剂生产的透明PP的各项性能均达到技术指标;并讨论了加工温度和树脂熔体流动速率对透明PP光学性能的影响。     

不同类型成核剂对聚丙烯性能的影响

研究了新型分子结构成核剂NX8000、有机磷酸盐成核剂NA-11以及无机纳米粉体二氧化硅对聚丙烯(PP)力学性能、透明性、结晶行为和耐热性能的影响。结果表明:3种成核剂能明显改善PP的拉伸强度,而对其冲击强度没有明显的影响;成核剂NA-11对PP增刚效果显著,NX8000的增透效果显著;3种成核剂都能提高PP的结晶度、结晶温度、熔融峰温度和维卡软化点。     

加工助剂对聚丙烯透明性能的影响

采用成核剂复配加工助剂对聚丙烯(PP)进行物理共混增透改性,利用差示扫描量热(DSC)、雾度测试等手段研究了成核剂对PP结晶行为、透明性的影响。结果表明,成核剂的引入提高了结晶温度和结晶度,透明性能得到明显改善;润滑剂类型对PP透明性能影响较大,硬脂酸钙降低PP透明性,而芥酸酰胺提高了PP的透明性;抗氧剂168对PP透明性影响较大,而9228对PP透明性影响较小。     

增刚成核剂对高熔体流动速率聚丙烯性能的影响

为解决高熔体流动速率(MFR)聚丙烯(PP)材料加工过程中，加工成型周期长而引发的翘曲变形大、光学性能差及外观美感性低等技术问题，将氢调法工艺生产的MFR为75～85 g/10 min的PP和不同厂家生产的成核剂采用熔融共混的方法等比例制备了四种高MFR的PP，分别利用激光粒度仪、差示扫描量热法、透光率雾度测定仪、万能试验机等手段，对比分析了不同粒径的α型成核剂对PP的熔融结晶性能、光学性能、力学性能、热收缩性能的影响。结果表明，成核剂的粒径大小对于PP的光学性能、MFR、横向和纵向收缩有一定影响，其中较小粒径及较窄粒径分布的增刚成核剂能得到雾度良好的PP，蓝相成核剂的加入能使PP获得更好的光学性能优良、额外的色素添加对于PP的力学性能没有影响。     

聚合物及助剂文摘

阻燃剂的合成在高分子材料中的应用;助剂对聚乙烯防雾滴膜性能的影响;增刚剂在聚丙烯中的应用研究;高分子增容剂对PP／PVA体系的影响;高效加工助剂WAC-88在大口径管材中的应用;复配型光降解剂的作用原理及配方设计……     

高韧性高模量改性聚丙烯着色专用料的研究

利用多种功能添加剂复合改性聚丙烯(PP),制成高韧性高模量PP。从几种PP组合中优选出综合性能最好的两种PP共混体系,研究了不同增韧剂及其用量、镁盐晶须作为增刚剂及其用量对PP着色专用料性能的影响,并选用环保型彩色混相无机颜料作为主着色剂。结果表明:以两种PP(K7726、K8303)为基体树脂,POE(8150型)与β晶型成核剂为增韧剂,经偶联剂处理的镁盐晶须为增刚剂,并用两步法动态硫化改性PP,当PP、POE与镁盐晶须三者的质量比为67:18:15时,改性PP的缺口冲击强度达到42.1 kJ/m~2,弯曲弹性模量为1 420 MPa,拉伸强度为18.6 MPa,达到了适用于类似汽车保险杠等制品的较高性能指标。     

Mechanistic investigation on moisture-induced softening of poly(vinyl acetate)-stiffened polyester fabrics

Softening phenomenon of fabrics stiffened with eco-friendly polymeric stiffening agents often occurs in service conditions, leading to a deteriorated stiffening style. It is highly desired to find the key factors that induce the softening of stiffened fabrics and to understand the softening mechanism. In this work, polyester fabrics and poly(vinyl acetate) (PVAc)-based stiffening agent were chosen as the typical fabrics and polymeric stiffening agent, respectively. The stiffness value, a sensitive style index for the stiffening effect of fabrics, was selected to evaluate the variation of fabric stiffening effect during storage. A phenomenon of rapid softening was observed in the fabrics stiffened with various amounts of PVAc-based stiffening agent. The stiffness value of stiffened fabrics decreased with the increase of hygroscopic amount. According to the hygroscopic kinetic data, the moisture-induced plasticization effect of stiffening agent film, and the detachment of stiffening agent film from the fibers caused by the moisture-induced weakening of interfacial interaction between the film and fiber, a possible softening mechanism of polymer-stiffened fabrics was proposed. The hygroscopic-drying cyclic experiments showed that the softening of stiffened fabrics was induced by the reversible plasticization effect and the irreversible interfacial damage between the film and fiber.     

硬挺剂的研制与应用

介绍了利用丙烯酸酯核壳共聚乳液生产硬挺剂的方法。研究了反应温度与乳液稳定性之间的关系 ,进一步探讨了乳液结构、单体组成对产品硬挺性能的影响。据此 ,确定了此硬挺剂工业生产的条件和工艺。最后 ,定量的检测了该产品的硬挺指标 ,并得到了满意的结果     

Modification of mechanical and color properties of polypropylene with colored nano-SiO2 prepared from diatomite

Diatomite powder was dissolved in alkali to form sodium silicate, which was then used to prepare colored nano-SiO₂ (CNS) by the process of chemical precipitation. The CNS was analyzed by means of X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and transmission electron microscopy. To explore the application of colored nano-SiO₂ in polypropylene (PP), CNS was incorporated into PP T30s. The mechanical and colorimetric properties of prepared CNS/PP composites were also investigated. The results of tensile tests indicated that the nanoparticles could simultaneously provide PP with stiffening, strengthening, and toughening effects at a low filler content (typically 2% by volume). At the same time, with CNS filler, the PP composites acquired a bright red color. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48328.     

制备工艺对抗静电聚丙烯抗静电性能影响的研究

用共混的方法制备了抗静电聚丙烯，研究丁共混方法和溶剂的使用对聚丙烯抗静电性能的影响。研究结果表明：双螺杆挤出过程中的剪切作用和有机溶剂的使用有利于抗静电剂的分散和迁移，可以提高聚丙烯的抗静电性能。乙醇为溶剂溶解抗静电剂，经双螺杆挤出混合制备出的聚丙烯抗静电性能较好。     

增韧剂及成核剂对PP–R复合材料性能的影响

采用注射成型法制备无规共聚聚丙烯(PP–R)复合材料,结合差示扫描量热仪、扫描电子显微镜、X射线衍射仪及偏光显微镜等技术,分析了乙烯–辛烯共聚物+高密度聚乙烯增韧剂及WBGⅡ型β成核剂对PP–R复合材料力学性能和结晶行为的影响。结果表明,增韧剂与成核剂对复合材料的综合性能有明显的影响,β成核剂和增韧剂同时加入到PP–R材料中,协效提高了复合材料的冲击强度,为78.7 k J/m~2,与纯PP–R材料比较提高了175%,而对拉伸及弯曲强度影响较小。同时,加入增韧剂及成核剂均能诱导α晶向β晶转变,晶粒细化,进而改善其冲击韧性。     

Crystalline morphology and dynamical crystallization of antibacterial β‐polypropylene composite

The crystalline morphology and dynamical crystallization of antibacterial polypropylene composite and pure polypropylene were investigated via differential scanning calorimeter (DSC), wide angle X‐ray diffraction (WAXD), and real‐time hot‐stage optical microscopy (OM). The results reveal that the crystalline morphology of antibacterial PP composites changes with variations of the crystallization conditions and compositions. The crystalline phase consists of both α‐PP and β‐PP crystals. The content of β‐PP decreases with the increase in antibacterial agent content and cooling rate. With the addition of β‐nucleating agent, the morphologies of all dynamically crystallized antibacterial PP composites show no obvious spherulitic morphology, and the decrease of crystal perfection and the increase of nucleation density of antibacterial PP composite system could be observed. With the increase of antibacterial agent content, the overall crystallization rates of the antibacterial PP composite increase dramatically, while the content of β‐PP in all antibacterial PP composite decrease distinctly under given cooling conditions. These results can be explained by the interruptive effect of antibacterial agent on interactions of β‐nucleating agent components and the obstructing effect of antibacterial agent on the mobility of PP chains in melts. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

DMDBS成核改性聚丙烯抗菌薄膜的研究

以二(3,4-二甲基二苄叉)山梨糖醇(DMDBS)为成核剂,油酸酰胺改性载银磷酸锆为抗菌剂,聚丙烯(PP)为基体树脂,制备了成核剂母粒、抗菌剂母粒和PP抗菌薄膜,并对PP抗菌薄膜的抗菌性能、光学性能及力学性能等进行了研究。结果表明:经DMDBS改性的PP抗菌薄膜,球晶尺寸减小,结晶密度增大,结晶温度提高;含0.2%DMDBS和0.8%改性载银磷酸锆的PP薄膜的纵、横向拉伸强度分别为49.92、33.42MPa,透光率为88.5%,雾度为3.0%,对大肠杆菌和金黄色葡萄球菌抗菌率分别为99.33%和98.35%。     

PE-UHMW/PP共混物的流动、力学与耐磨损性能研究

将均聚型聚丙烯(PP)、耐磨助剂与超高分子量聚乙烯(PE-UHMW)共混,制备了PE-UHMW/PP共混物,研究了PP含量及耐磨助剂对PE-UHMW/PP共混物流动、力学与耐磨损性能的影响。结果表明,PP能有效地改善PE-UHMW的流动性能,PE-UHMW/PP共混物的维卡软化点和热变形温度均随PP含量的增加而增加;加入耐磨助剂后,当PP的质量分数为50%时,共混物的拉伸强度达到最大,但断裂伸长率最小,且随PP含量的增加,PE-UHMW/PP共混物的冲击性能降低;PP降低了PE-UHMW的耐磨损性能,加入耐磨助剂后保持了PE-UHMW的高耐磨损性能且对共混物的流动和力学性能影响不大。     

α-成核剂对聚丙烯结晶性能和形态的影响

用差示扫描量热仪（DSC）、广角X射线衍射（WAXD）研究了不同含量的α-成核剂对聚丙烯的结晶行为和结晶形态的影响，用偏光显微镜观察了结晶尺寸大小的变化，测试了聚丙烯的力学性能，同时对聚丙烯的透光性也进行了表征。结果表明，添加少量α-成核剂提高了聚丙烯的结晶温度和结晶度。且随α-成核剂的添加，聚丙烯的球晶尺寸明显缩小，聚丙烯的拉伸强度也相应增强。当α-成核剂的质量分数为0．3%时，拉伸强度最大，薄片的透光性显著改善。